On 03/28/12 09:22, Tetsuya Murakami wrote:
> In terms of CNP, CNP needs to be calculated every time if the packet
> is toward to outside of domain because the embedded IPv4 address
> could be different. So, I think there is no difference between CNP
> and recalculation of L4 checksum from the implementation point of
> view.
On the contrary, there is a big difference. The difference is that you
are only concerned with L3. L4 can change: UDP, TCP, ICMP, STCP, DCCP,
etc, etc, etc. You need a lot of code to handle all existing transport
protocols, and you still can't handle future protocols that people might
develop.
Checksum neutrality is a *big* advantage.
Simon
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